Improvement in knife-heads for harvesters



G. W. HARRSON.

KNIFE-HEADS For. HARVESTERS.

Patented Nov. 9,1875.

IJV VENTOR WITJV'EAS'SES mg .Jftorn eys.

PATENT @Errea GEORGE W. HARRISON, OF LANSING, MICHIGAN.

IMPROVEMENTVIN KNIFE-HEADS FR HARVESTERS.

l Specication forming part of Letters Patent No. 169.696, dated November9, 1875; application filed September :29, 1875.

To all 'whom it may concern A Be it. known that I, GEORGE W. HARRISON,of Lansing, in the countyot' Ingham and State of Michigan, have inventedcertain new and useful Im provemcnts in Knife-Heads for Harvesters; andI do hereby declare the follow@ ing to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it pertains to make and use it, reference being had to theaccompanying drawings7 which form part of this specitcation.

My invention relates to reapers, mowingmachines, and others ofthe classot harvesters; and consists in a novel construction and arrangementofthe knife-head or pitman connection or coupling t'or connecting' theptman to the cutting-knife.

Ihe object ot' my invention is to so construct Vthe coupling-head bywhich the pitman is united to the cutter-blade of harvesters as to adaptthe head to be applied to the knives of any and all harvesters now inuse, and be changed from one knife to another without cutting the rivetsused to secure the head to the knife, or remove the head base-plate fromthe knife.

In order to accomplish this, instead of making the coupling-head orboxes square and united to, and a permanent part ot', the heel or baseplate, as shown in the patent granted to me September 26,1871, No.119,356, I make the head of a hollow cylinder, and separate anddetachable from the headplate, and unite the two by a peculiar variedjoint, as hereinafter more fully set forth and shown.

In the drawings, Figure 1 is a perspective view of' my coupling or headas secured to the knife and pitman; Fig. 2, a vertical centrallongitudinal section of same; Fig. 3, detached views of the two forms otrubber bearings or packing; and' Fig. 4:, detached views ofthe two formsotmetal bearings or boxes for the end of the Pitman-connection.

A is the harvester-knife, to the heel of which is secured, by bolts orrivets a, the head or coupling base plate or bar B. G is thecoupling-head, and H the pitman-arm, united to the pitman by thescrew-coupling H. The coupling-head is constructed ot' a hollowcylinder, C, constructed on its under side with peculiar and variedundercut portions, C1 C2,

and a rear tongued portion, C3 c, which it into correspondingly formedor recessed portions B1 B2 B3 in the plate B, the cylinder and baseplatebeing held in place together at the rear by a screw-bolt, B4, whichpasses through both -base'plate B and rear projection U3. Theseprojections, notches, &c., on the base of the cylinder and in thebase-plate may be varied, or of any particular or desired form orconstruction, and be varied in different machines, and the'cylinder maybe so formed as to adapt it to tit any base-plate, no matter what theparticular form the intermediate notch or slot may be. Within thecylinder C, at each end,

`are screw-plugs or heads D D, which abut against rubber blocks E E. F Fare metal boxes, between which the projecting end d ot the coupling-armH of the pitman is housed.

These rubber blocks or packings may be made solid, as shown at E, orwith a central hole, e. as shown at E', Fig. 3, or it may be one solidblock, just fitting within the cylinder, with a hole in the side, asshown at EX; and the metal bearings or boxes F F may also be solidthatis, with a plain curved back, as shown at F, which fits against thesolid packing E, or with a projectiomf, at the back, as shown at- F',Fig. et, which fits into the central hole e iii the rubber packing E',whereby the metal hearin g is always held secure in position. Thecylinder C is formed with an oblong hole, D', at one side, through whichthe arm H of the pitman passes.

By this construction and arrangement it will be seen that the head maybe readily and quickly removed from the knife, and without removing theheel or base plate, and applied to another knife, and the coupling-headis of such small size and shape that it may be applied to any machinewithout interfering with thc other parts.

The rubber packing within the coupling head, surrounding the `arm of thepitman, is compressed or driven against the pitman by screwing up thescrew-heads D D as the packing wears away. 'Ihus all noise, jar, andrattling of the parts are prevented, and alljar ot' the drivingmechanism is received thereby, and not transmitted to the knife; but aneasy elastic motion is communicated thereto.

I have described the head as being of a cylindrical external shape; butI do not confine myself' to this particular' form, the gist of theinvention being in the screw-heads, to compress the journals.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In combination with the knifeA, the base or heel plate B, secured tothe knife by rivets u, and constructed at its top rear edge withundercut varied projections or joints B1 B2 B3, and for the purposesdescribed.

2. In combination with the plate B, constructed with projections and`recesses Bl B2 B3, the coupling-head C, constructed with variedrecessed and notched base G1 C2 C3 fitting therein, as and for thepurposes described.

3. A coupling -head or pitinan connection for harvesters, made in twoseparate and distinct parts, whereby the head may be removed from thebase-plate, by which it is secured to the heel ot' the knife and appliedto different blades of different harvesters, substantially as and forthe purposes described.

4. The coupling-head or pitman-connection for harvesters, composed ot'separate and removable head G and base-plate B, the two united by ajoint between the two and bolt B",

and to the knife by rivets or bolts passing through the knife and plate,substantially as and for the purposes described.

5. The hollow coupling-head C, constructed with varied notched base C,and provided at each end With screw-plugs D D, as and for the purposesdescribed.

6. In combination with the hollow couplinghead C, constructed withvaried notched base C1, and screw-plugs D D at each end, the rubberpacking E E, and metal boxing F F, placed at each side of the pitmanarmand adapted to be adjusted independently of each other by thescrew-heads D D, as and for the purposes described.

` 7. In combination With the hollow head O and screw-heads D D, therubber packing E fitted within the head C and adapted to be adjusted ateither end by the plugs D D, as and for the purposes described. f

8. In combination with the head (J and packing E F, the bent arm H,entering the cylinder through oblong opening D2, and connected to pitmanby screw-coupling H', as and for the purposes described.

9. The combination of knife A, cylinder O, base-plate B, made seperatetherewith, and pitman-arm H, entering the cylinder only at one side, asand for the purpose described.

10. The {mman-connection for harvesters, composed ot' separatebase-plate B and cylinder U, screw-heads D D, rubber packing E E, metalboxes F F, and pitman-arm H, all constructed and united substantially asand for the purposes described.

In testimony that I claim the foregoing l have hereunto set my hand this10th day ot' September, 1875.

GEORGE W. HARRISON.

Witnesses:

SCHUYLER S. OLDs, CHARLES J. OLIN.

